Work-support for milling-machines.



APPLICATION FILED 0OT.8, 1913.

Patented June 16,1914.

3 SHEETS-SHEET 1.

P. BROWN & F. J. BOSTOUK. WORK SUPPORT FOR MILLING MACHINES.

APPLICATION FILED 00128, 1913.

Patented June 16, 1914.

3 SHEETS-BHEBT 3.

Fig.5.

Fig.

FRANCIS JOHN Bos'rocn,

WORK-SUPPORT FOB I 1 00,522. Specification of Application fled Octobera,

mLING-MA HINES.

1913. Serial 10.794943.

To all whom it may concern:

Be it known that we, Pnncr BROWN and 7 subjects of King George V ofGreat Britain, residing at Huddersfield, in the county of York, England,have invented certain new and useful Improvements in Work-Supports forMilling- Machines, of which the following is a specification.

This invention in worm wheel generators or like milling machines has forits object the provision of improved means whereby the table can bedisconnected from its drive at will and rotated freely by hand in orderto test the truth of the work to be cut and also to admit of adjustmentof the Wheel blank relatively to the bobbing cutter to cause said cutterto operate on different teeth, said improvements also providing for thelubrication of the parts.

The inventionwill be described with reference to the accompanyingdrawings in which Figure 1 is a plan view of the work supporting anddriving portion of a worm wheel generating machine embodying ourimprovements; Fig. 2 is a sectional elevation taken as on the line AA,Fig. 1; Fig. 3 is a front view of the table driving device,disconnected, and Fig. 4 is an end view of Fig. 3, looking in thedirection of the arrow B, said figure.

Referring to the drawings, the table 1 has a depending cylindricalportion 2 which is mounted in a long parallel bearing 3 in suit ablesurrounding frame-work 4. Near its upper end the frame is provided witha conical bearing 5 on which rests a corres nd ing conical portion 6 onthe table. hese parallel and conical bearings support the table rigidly,the downward thrust during cutting being taken by the conical bearing 5.A liner plate 60 is interposed between the bearings 5 and 6, but thismay be dispensed with.

Formed integral with the table 1 or, it may be, attached to said tableis a worm wheel 7 whose diameter is approximately twice the diameter ofthe largest wheelthat can be cuton the machine, whereby great ac curacyis insured when the machine is cuttmg at its maximum capacity.

In the upper portion of the table are formed a series of slots oropenings 8 which admit of the cuttings from the work falling or beingforced through them through a cavity or space 9 formed between the tableand the central part of the framework, into her or receiver 10 in of theframework, from which they can be removed from time to time through anopenmg closed by a door 11. -A false bottom 12 allows the lubricant,supplied during the cuttmg operation, to drain from the cuttings into awell 13 from which it can be returned through an outlet 14 to the pumpwell for re-use, or the said lubricant may be drawn off, as desired, bya drain cock 15. The false bottom 12 is g to our invention, we supportin suitable hearings in the framework at each side of the machine, acradle 16 in which is journaled a spindle .17 (Fig. 3 having fastthereon a worm 18 adapted to mesh with and drive the worm wheel 7 on thetable. Also fast on the spindle 17 are mesh with spiral wheels 21 and 22fast on a shaft 23 extending within the lower part of the cradle. Thisshaft 23 is driven b change gearing 24 and bevel wheels, 25, 25, fromthe main driving shaft 26 of the mac e.

Fast on the boss 27 of the cradle is a partially toothed wheel'ortoothed segment 28 with the teeth of which meshes a Worm 29 fast on aspindle supported in a suitable vertical bearing 30 on the frame.

By rotation of the worm 29, the spindle of which is provided with asuitable handle or handwheel, the cradle 16 can be rocked or turnedabout its pivotal center, which is that of the shaft 23 and by reason ofthe eccentric sition of the spindle 17 carrying the Worm 18, the saidworm will be disengaged from the worm wheel 7 on the table and thelatter thus be left free to be rotated by hand.

spiral wheels 19 and 20 which respectively In order to lock themechanism, when the cradle has been turned or rocked to cause the worm18 to mesh with the worm wheel 7, we provide a handwheel 31 whose'boss32 works on a screw 33 carried by the cradle, rotation of the handwheelin one direction forcing a locking collar 34 against the worm or segmentwheel 28 and pressing the opposite face of said wheel against a facing35 on the framework. A projection 36 on the cradle is adapted to abutagainst a part of the framework to limit the movement of the cradle inone direction. The use of the looking collar 34 prevents all oscillationof the cradle when the worm 18 is driving the worm wheel 7, and as itrelieves the worm wheel 28 and the worm 29 of pressure, they can be madewith the usual clearance between their teeth. V

The means above set forth for enabling the work table to be disengagedare of considerable advantage, and enable the operator to freely revolvethe table whenever desired, to test the truth of the work being cut, orto adjust the work relatively to the cutter in order to present fresh oruncut spaces in the work opposite the teeth of the cutter.

The worm 18 meshes with a worm 37 mounted on the shaft 23 and running inan oil bath 38 formed in the cradle 16, the said worm 37 automaticallyconveying lubricant from the bath 38 and applying it to the toothsurface of the driving worm. An annular channel 39 formed on the innerwalls of the framework beneath the worm wheel 7, as shown at Fig. 2,receives any lubricant which may drop from said worm wheel andconveys itback to pockets 40, 40, in the cradle 16 from which it finds its wayback through suitable openings into the bath 38.

Suitable shields or guards 41 and 42 prevent the entry into the oil bathand annular channel 39 of any metal cuttings or foreign bodies.

A sleeve 43, extending down within the depending portion 2 of the tableand provided at its upper end with a flange 44 adapted to be bolted tothe table, receives at its upper end a micrometer screw adjusting 'nut45 and bush 46 the latterbeing provi ed with a keyway, to slide on a key47 carried by the work spindle 48, the latter being made conical at itslower end and being secured in a correspondingl shaped opening in thesleeve by a screwe plu 49. The blank to be cut is secured on the spindle48 and rests upon the top of the bush 46, whose adjustment relatively tothe sleeve 43 enables the vertical height of the blank to be adjusted toposition it accurately with respect to the cutter.

Our improvements enable-the table to be run at such a speed that themaximum advantage of a high speed cutter can be utilized.

Having thus described our invention, what we claim as new and desire tosecure by Letters Patent is 1. The combination, with a supporting frame,a revoluble work table mounted in the frame, and a worm wheel secured tothe work table; of a cradle pivoted in the frame, a driving shaftjournaled on the axis of the cradle, a worm shaft journaled eccentric ofthe axis of the cradle, a worm secured to the worm shaft and operatingto revolve the worm wheel, driving devices operatively connecti the wormshaft with the driving shaft, aifd means for oscillating the cradle toplace the worm into and out of engagement with the worm wheel.

2. The combination, with a supporting frame, a revoluble work tablemounted in the frame, and a worm wheel secured to the work table; of acradle pivoted in the frame,

a driving shaft journaled on the axis of the cradle, a worm shaftjournaled eccentric of the axis of the cradle, a worm secured to theworm shaft and operating to revolve the worm wheel, driving devicesoperatively connecting the worm shaft with the driving shaft,disengageable locking mechanism for securin the cradle rigidly to theframe, and means or oscillating the cradle, when unlocked from theframe, to place the worm into and out of engagement with the worm wheel.

3. The combination, with a supporting frame, a revoluble work tablemounted in the frame, and a worm wheel secured to the work table; of acradle pivoted in the frame and formin a rece tacle for lubricant, adriving sha journa ed on the axis of the cradle, a worm shaft journaledeccentric of the axis of the cradle, a worm secured on the worm shaftand operating to revolve the worm wheel, driving devices operativelyconnecting the worm shaft with the driving shaft, a worm mounted looselyon the driving shaft and engaging with the aforesaid worm and operatingto convey lubricant to it from the said receptacle, and means foroscillating the cradle to place the worm which drives the worm wheelinto and out of engagement with it. i

4. In a worm wheel generating or like machine, the combination with arevolubly supported work table, and a worm wheel formed integral with orattached to the table, of a drlving worm mounted on a spindle supportedeccentrically in a pivotally movable cradle, said spindle carrying gearwheels meshing with gear wheels on a shaft extending longitudinally ofthe cradle, means to drive said shaft to rotate the driving worm, meansto turn the cradle about its pivotal axis to place the driving worm-into or out of engagement with the worm sition, all substantially asherein shown and Wheel on the table, a worm dipping into an set forth.oil bath in the cradle and adapted to. mesh In testimony whereof weaflix our signawith the driving worm and automatically tures in thenresence of two Witnesses.

5 convey lubricant thereto, an annular chan- PERCY BROWN. nel to returnto the oll'bath any lubricant which may drip from the Worm Wheel, aFRANCIS JOHN BOSTOCK' shield or cover on the revolubletable toWitnesses: prevent metal cuttings falling into said T. E. WHITELEY,

10 channel, and means to lock the cradle in po- C. E. HINCHLIFF.

